Proton widths of the low-lying F-16 states from the N-15(Li-7,Li-6)N-16 reaction

All the F-16 levels are unbound by proton emission. To date the four low-lying F-16 levels below 1 MeV have been experimentally identified with well established spin-parity values and excitation energies with an accuracy of 4 - 6 keV. However, there are still considerable discrepancies in their level widths. The present work aims to explore these level widths through an independent method. The angular distributions of the N-15(Li-7,Li-6)N-16 reaction leading to the first four states in N-16 were measured using a high-precision Q3D magnetic spectrograph. The neutron spectroscopic factors and the asymptotic normalization coefficients for these states in N-16 were then derived based on distorted wave Born approximation analysis. The proton widths of the four low-lying resonant states in F-16 were obtained according to charge symmetry of strong interaction.